Apparatus for the production of artificial thread



Aug. 31, 1937. R, PICA D 2,091,612

APPARATUS FOR THE PRODUCTION OF ARTIF ICIAL THREAD Filed Oct. 31', 1935 L INVENTOR. 8 Rene Picard ATTORN Y.

Patented Aug. 31

APPARATUS FOR THE PRODUCTION OF AR- I TIFICIAL THREAD This invention relates to Rene Picard,

Vaulx en Velin, France, assignor, by

mesne assignments, to E. I. du Pont de Nemours & Company, ration of Delaware Wilmington, Del., a corpo- Application October 31, 1935, Serial Ne. 4mm

1 Claim.

the production of artificial thread, and more particularly it relates to the production of artificial thread having an uneven or irregular denier.

This invention will be described with particular reference to the production of artificial threads produced from viscose, nevertheless, the invention is applicable to the production of artificial threads composed of coagulable solutions vention may be applied tificial threads from cellulose derivative compositions in an organic solvent which will be coagulable in the presence of heated gases or it may be applicable to broadly, that is, the into the production of arthe production of regeneratedcellulose or cellulose derivative threads from solutions coagulable in a liquid coagulating bath. n In the production of artificial threads having a varying denier it is often desirable to form such threads with frequent example, pongee silk.

and sharp variations in the denier so as to simulate certain materials, for

In certain methods and apparatus proposed heretofore for the production. pf uneven denier appearance.

yarns, the variation in 5 denier was so slight and gradual that fabrics produced therefrom did not have the desired It is therefore anobject of the present invention to provide means frequently and sharply.

It is a further object to provide means for 5 denier yarns which can 'tional artificial yarn for the production of artificial threadshavingan uneven denier in which the unevenness or irregularity .of denier varies of the present invention the production of uneven be attached to convenproduction mechanism without extensive change or modification of such mechanism.

It is another object of the present invention to provide a means even denier yarns by pas forming solution through for the production of unsing a coagulable threada conduit to a spinning nozzle and intermittently interrupting the flow conduit.

the invention will appear invention are achieved in liquid flow regulating debetween a liquid pressure nozzle. This regulating device is comprised essentially of a body memher having an inlet and an outlet opening therein, and having a movable liquid-obstructing member disposed within said body member and 55 adapted to periodically shut off and turn on the flow of liquid to said body member between said inlet and outlet openings. This regulating device is preferably in the formof a large throttling valve having a plurality of openings through a rotatable valve plug.

The inventionwill be more clearly apparent by reference to the following detailed description taken in connection with the accompanying form of regulating device constructed in accordance with thepresent invention;

Fig- 3 is a vertical sectional View through a modified form of regulating device;

Fig. 4 is a sectional plan view taken along the line' l,-4 of Fig. 2;

Fig. 5 is an elevational view of the device shown in Fig. 3 with the body partially broken away along the line, 5--5 of Fig. 3;

,Fig. 6 is asectional plan view along the line 6+6 of Fig. 3.

Referring to Fig. 1 of the drawing, reference numeral H designates a pipeline for the passing ofv a coagulable thread-forming solution to a liquid-pressure pump l2. This pressure pump may be driven .in any desired manner by means of pump drive shaft l3. The coagulable solution passing from the. pump I2 is led through pipeline I5, pressure dome l1, pipeline I9, regulating device 2|, pipeline 23, candle filter 25, pipeline 21 and thence to a spinning nozzle (not shown). The regulating device 2| having inlet and outlet openings connecting pipelines l9 and 23 respectively is provided with a revolving plug having a stem 29 which may be driven by means of bevel gears 30 and 3|, which in turn may be driven by means of a motor 33 and gear-reduction mechanism 35. If desired, the stem 29 may be driven by the same driving means which is connected for driving the pump 12.

The regulating device indicated generally by reference character 2| and illustrated in Fig. 2 of the drawing, comprises a body member 40 having an inlet opening 42 and an outlet opening 44. Rotatably positioned within the body member 40 is a plug 46 which is provided with a plurality of radially extending openings 48, 49, 50, 5|, 52, 53, 54 and 55. The plug may be rotated by means of the plug stem 56 in the manner described above. I

ment with the inlet opening 42. When one of the radially extending openings 48 to is in alignment with the inlet opening 42 the cooperating oppositely radially extending opening will be in alignment With the outlet opening 44. As will be noted by reference .to Fig. 4 of the drawing, when opening 48 is in alignment with inlet opening 42, opening 52 will be in alignment with outlet opening 44, thus forming a continuous passage.

from the inlet to the outlet opening through the valve plug. The size and number: of openings may be varied in any desired manner to produce the desired spacing between variations in denier and to provide any desired abruptness in the variation of denier.

In the modification shown in Fig. 3 of the drawing, the valve body 6!! is provided with inlet opening 62 and outlet opening 64 in the same manner as above described with reference to- Figs. 2 and 4 of the drawing. Body is further provided with inlet and outlet grooves'or cham hers"!!! and 12 respectively. Rotatably positioned within the interior of the body '60 is a plug containing openings 82, 83, 8.4 and 85, adapted to successively connect the inlet chamber 10 with the outlet chamber 12. The plug 80 is adapted to be rotated in the same manner as above set forth with reference to plug 46-of Fig. 2.

In the production of artificial threads or filaments having avariat'ion indenier by means of the above described mechanism; the viscose, or other coagulable thread-forming liquid is forced under pressure through pipe lines l5 and I9 and into the regulating device by means of the liquid pump l2. As the plug (46 or 80) of the regulating device is rotated the inlet andputlet openings of the regulating device will be alternately connected and disconnected. When the inlet and outlet openings of the regulating device are connected the pressure from the pump I! will force the thread-forming liquid through the regulating device and when the said openings'are disconnected the now will temporarily cease. The pressure dome ll positioned between pipelines l5 and I9 will function to prevent the building up of an excessive pressure. in the pipeline during the period when the fiow'of liquid through the regulating device is stopped. The flow of liquid through the candle filter and spinneret will consequently be of a pulsating, although of an alternating, nature. Obviously care mustbe taken in adjusting the timing of the regulating device to provide a constant although varying supply of viscose at the spinneret openings so as to obtain a continuous filament or thread. The thread is preferably drawn from the spinneret at a constant rate of speed. The thread or filament thus formed may vary greatly in denier along its length and may be made to contain nubs or lumps at intervals along the length of the thread. Alternatively, the thread may consist of alternate extended sections having a fine denier and a large denier, the junction between said sections consisting of comparatively abrupt variations.

The motor, or other means, for rotating the plug of the regulating device may be of the Variable speed type so as to obtain variation in denier at irregular intervals along the length of the thread. Furthermore, the liquid pressure pump may be driven at a variable speed or the openings through the plug may be spaced irregularly, if desired, so as to further vary the irregularity in denier of the thread. The variation in denier of the thread and the spacing of the variations in denier along thelength of the thread can be still further varied by varying the speed at which the thread or filament is drawn from the spinneret.

It will be obvious that many changes and modifications in the'procedure and structure can bemade in the specific details as described and illustrated. It will therefore be understood that the invention is not to be limited bythe details of the above description except as set forth in the appended claim.

I claim:

In an apparatus for the production of artificial thread having an uneven denier, a liquid conduit,

a liquidpump for passing a coagulable threadforming solution through said conduit to a spinning nozzle, 21. regulating device in said conduit, said regulating devicecomprising a body member having inlet and outlet openings and cooperating inlet and outlet chambers, a plug member rotatably positioned in said body member between said inlet and outlet chambers, a plurality of openings spaced axially along said plug member, said openings in said plug member adapted to alternately connect said inlet and outlet chambers to form a continuous passage through said device, and meansfor rotating said plug member whereby to intermittently connect and disconnect said inlet and outlet openings.

RENEPICARD; 

